Keystones — Capstone
Five GCSE retrieval questions · 31 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 236.8cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 46, 41, 23, 13, 48, 81, 25, 97. Give your answer to 2 decimal places
Answer: Mean = 46.11, Median = 41, Range = 84